I would personally love to have the Torrent from Borderlands The Pre Sequel. In Borderlands, it's a fully automatic SMG with great stability and fire rate that burst fires when aimed down sight. If in Destiny, it would be classified as an Auto Rifle but would gain impact and stability while losing fire rate while aiming down sights, functioning as a Pulse Rifle.
Edit: As another thought...
I would also like the Monado from Xenoblade Chronicles, but with a twist. In Xenoblade, the Monado was a sword powerful enough to slice through these "alien" robots named the Mechon, and can give buffs to the wielder or his or her allies, and even give debuffs to the wielder's enemies.
In Destiny, it would be an auto rifle that does arc damage. It's base effect would give the user bonus damage to Vex targets. It's special effect would be randomly staggering (toppling) nearby enemies, giving a shield to allies and yourself, sealing enemies' special abilities like a suppressor grenade, giving bonus speed to allies, firing a single powerful blast emptying your clip, or giving the bonus Vex damage effect to your allies.
English
#Destiny
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Ray gun world at war! Exoctic Hand cannon void/solar/arc damage Precision head shots explode enemies